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From Wikipedia:

John Wallis

John Wallis was an English clergyman and mathematician who is given partial credit for the development of infinitesimal calculus. Between 1643 and 1689 he served as chief cryptographer for Parliament and, later, the royal court. He is credited with introducing the symbol ∞ to represent the concept of infinity. He similarly used 1/∞ for an infinitesimal. John Wallis was a contemporary of Newton and one of the greatest intellectuals of the early renaissance of... Read More

Born3 December [O.S. 23 November] 1616
Ashford, Kent, England
Died8 November 1703 (aged 86) [O.S. 28 October 1703]
Oxford, Oxfordshire, England
NationalityEnglish
FieldsMathematics
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